Each one is custom made for a city.
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That’s so cool. To add to this, I googled a bit more about the project, and stumbled upon an article by Atlas Obscura that goes into a bit more detail, and this Pinterest board with lots more photos of various designs.
Nice 👍 thanks for adding more info!
I’m sorry, I had to stop reading at “Society for Manhole Lovers”.
Haha wait! Come back! We have manhole mania!!